Question 1 :
Two identical metallic spheres A and B of exactly equal masses are given equal positive and negative charge respectively. Then:
Question 2 :
If $\oint _{ s }^{  }{ \overrightarrow { E } .\overrightarrow { d } s } =0$ over surface, then
Question 3 :
If the number of electric lines of force emerging out of a closed surface is 1000, then the charge enclosed by the surface is
Question 4 :
An electron is placed at the centre of a conducting sphere of radius $0.2$ metre having a uniform charge $5\times 10^{-2}$ coulomb. The force on the electron is :
Question 5 :
Deuteron and $\alpha$-particle are put $1{A}^{o}$ apart in air. Magnitude of intensity of electric field due to deuteron of $\alpha$-particle is $(N/C)$<b></b>
Question 7 :
A $1\ \mu A$ beam of proton with a cross-sectional area of $0.5\ sq. mm$ is moving with a velocity of $3\times 10^4\ ms^{-1}$. Then charge density of beam is
Question 8 :
 If E=0, at all points of a closed surface. The total charge enclosed by the surface is zero.
Question 9 :
Which of the following statements are true:A: Charge cannot exist without mass but mass can exist without charge<br/>B: Charge is invariant but mass varies with velocity<br/>C: Charge is conserved but mass alone may not be conserved
Question 10 :
The force acting between two point charges kept at a certain distance is $5$N. Now the magnitudes of charges are doubled and distance between them is halved, the force acting between them is _________ N.
Question 11 :
Electric force <u>                  </u> on the nature of the medium between the charges.
Question 12 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Two charges $2C$ and $6C$ are separated by a finite distance. If a charge of $-4C$ is added to each of them, The initial force of $12 \times10^{3}N$ will change to :<br/></p>
Question 13 :
The field potential inside a charged ball of radius R and centre at o depends only on distance from its center as $ V(r) = \alpha r^2 + \beta $ when $ \alpha , \beta $ are +ve constant. now choose correct options
Question 14 :
Assertion: A small electric dipole is moved translationally from higher potential to lower potential in uniform electric field. Work done by electric field is positive.
Reason: When a positive charge is moved from higher potential to lower potential, work done by electric field is positive.
Question 15 :
The sum of two point charges is $7 \mu C$. Theyrepel each other with a force of $1 N$ whenkept $30 cm$ apart in free space. Calculatethe value of each charge.
Question 16 :
The torque acting on a dipole of momentum $\vec { p } $ in an electric field $\vec { E } $:
Question 17 :
Charges $Q_1$ and $Q_2$ are placed inside and outside respectively of an uncharged conducting shell. Their seperation is r.
Question 18 :
Fill in the blanks.<br/>A field normal to the plane of a circular wire n turns and radius r which carries a current I is measured on the axis of the coil at small h distance h from the centre of the coil. This is smaller than the field at the centre by a friction ____